>The EU can make arbitrary changes very quickly if all member states are in agreement

And the US can make arbitrary changes very quickly if only 50% of the house and 60% of the senate is in agreement. That's a hell of a lot easier to do than the insane unanimity required for EU legislation.

>You could point to the sudden changes in economic and military policies in the EU following the invasion of Ukraine as an example of the EU reacting quickly to something.

It was still far too slow to matter.

>For example, it doesn't have a military or police force to speak of, and it has little involvement in public services and social policies.

And the only reason this isn't an immense problem is entirely because the US props up the EU from a defense perspective.